LaMotte SMART Spectro Spectrophotometer - Manual (Page 165)

PROCEDURE
Use universal sample holder.
1. Press and hold ON button until spectrophotometer turns on.
2. Scroll to and select PROGRAMMED TESTS.
3. Scroll to and select ALL TESTS (or another sequence containing
46 H Peroxide-LR) from TESTING MENU.
4. Scroll to and select 46 H Peroxide-LR from menu.
5. Rinse a clean tube (0290) with sample water. Fill to the 10 mL line with
sample.
6. Insert tube into chamber, close lid and select SCAN BLANK. (See Note)
7. Remove tube from Spectro and add 4 drops of *Hydrogen Peroxide Reagent
#1 (6452). Cap and mix.
8. Add one *Hydrogen Peroxide LR Tablet (6454A). Crush tablet with tablet
crusher (0175). Cap and mix for 30 seconds. Solution will turn pink if hydrogen
peroxide is present. Wait 5 minutes for full color development.
9. At end of 5 minute waiting period, mix, insert tube into chamber, close lid and
select SCAN SAMPLE. Record result.
10. Press OFF button to turn spectrophotometer off or press EXIT button to exit to
a previous menu or make another menu selection.
NOTES: For best possible results, a reagent blank should be determined to
account for any contribution to the test result by the reagent system. To determine
the reagent blank, follow the above test procedure to scan a distilled or deionized
water blank. Then follow the above procedure to perform the test on a distilled or
deionized water sample. This test result is the reagent blank. Subtract the reagent
blank from all subsequent test results of unknown samples. It is necessary to
determine the reagent blank only when a new lot number of reagents is obtained.
For the most accurate results, the sample and reagents should be at 25±4°C.
HYDROGEN PEROXIDE, Low Range SMART Spectro Test Procedures 2.11
Test P
rocedures